Dear Brian, many thanks for your response as well. However, you said
that the 2sls relative bias statistic is available for 1 or 2 endogenous
regressors, not for any more. Note though that in one of my main
regressions, I have only 2 end. regressors, but no 2sls relative bias
statistic. My equation looks like this:

The critical values for the 2SLS relative bias with two endogenous
regressors are only available if you have at least four excluded
instruments. With one endogenous regressor, the critical values are
only available if you have at least three excluded instruments.